Vortex 491ZB-40 520-Pitch Steel Rear Sprocket Black 40-Tooth

The Vortex 491ZB-40 is a 520-pitch steel rear sprocket featuring a 40-tooth count and an electro-plated satin black zinc finish. Built to Vortex's exacting race-proven standards, this sprocket delivers a strong balance of durability, corrosion resistance, and consistent power transfer for street and performance motorcycle applications.

Key Features:

• 520 Pitch — Compatible with 520-series chain for optimized power transfer
• 40-Tooth rear sprocket for precise gearing configuration
• Carbon steel construction — Hardened teeth maintain shape under demanding conditions for extended service life
• Black zinc electro-plated finish — Satin black coating resists corrosion and harsh elements
• Precision CNC machined — Manufactured to tight tolerances for accurate fit and maximum chain engagement efficiency
• Vortex patented unique tooth design — Engineered for optimal chain hold and release, increasing sprocket longevity
• Weight-reduction cutouts — Strategically lowered surfaces reduce rotating mass and improve throttle response

Vortex Racing is a U.S.-based manufacturer with a long history of supplying top-quality components to professional race teams across Motocross, Supercross, Road Racing, and Flat Track disciplines. Each sprocket is built to the tightest tolerances using the best quality materials available, ensuring race-level reliability for everyday riders and competitors alike.